/Engine/Plugins/Runtime/Synthesis/Source/Synthesis/Public/UI/SSynthKnob.h
Called after a key is released when this widget has focus
Returns whether the event was handled, along with other possible actions
virtual [FReply](API\Runtime\SlateCore\Input\FReply) OnKeyUp ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & MyGeometry, const [FKeyEvent](API\Runtime\SlateCore\Input\FKeyEvent) & InKeyEvent )